Machines



(No Model.) 2 Sheets-Sheet l.

R. W. WHITNEY.

TRIMMER FOR SEWING MACHINES.

Patented 00 12, 18 86.

T a-R Attorney i ywh WITNESS-E8 (DI XV TERS, Pmwmho m hnr, wmmn m". u. c.

2 SheetsSheet 2;

(No Model.)

B. W. WHITNEY.

TRIMMER FOR SEWING MACHINES.

Patented Oot. 12

WITNESSES A Home y N. FETERS, Plmkrlflhognphon Washingion. D C.

UNIT D STATES PATENT. OFFICE.

RUEL WV. WVHITNEY, OF CLEVELAND, OHIO, ASSIGNOR TO THE WHITE SE-VVING-MAOHINE COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 350,514, dated October 12, 1886.

Application filed November 21, 1885. Serial No. 183,475. (No model.)

iug to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in trimmers for sewing-machinesin which shears are employed having a stationary blade removably attached'to the cloth-plate and a vibratory blade, the latter being operated by a rock'arm connected with the rock-shaft that operates the needle-bar, a connecting-rod being pivoted to the said rockarm and to thevi- I bratory blade, the object being to simplify the construction, and to reduce the initial cost of this class of sewing-machine trimmers.

With these objects in view my invention consists in certain features of construction and in combination of parts,hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a sewing-machine with my improved trimmer attached. Fig. 2 is a rear end elevation. Fig. 3 is aside elevation, being the reverse of Fig. 1. Fig. 4 is a front end elevation. Figs. 5 and 6 are enlarged elevations of the trimmers being, respectively,side and edge views.

A represents the stationary blade of the shears, and B the vibratory. blade, the latter being pivoted to the former, forming,substantially, shears for trimming the fabric on a line parallel with and near to the line of stitching. The blade A extends through a slot in the cloth-plate, and is bent at right angles, the lateral part to extending under the clothplate 0, to which it is detachably secured by the screws 0. The blade A extends some little distance rearward of the pivot a, and terminates in a broad plate,A,for engaging and rubbing on the corresponding part of the vibratory blade, by means of which the cutting edges of the blades are held in lateral contact without causing that excessive strain on the pivot a that would otherwisebe had, especially in cutting heavy fabric. The rear'end of the blade B is pivoted at b to the connectingrod D, the latter .in turn being pivoted at d to the roekarm E. This arm is secured to the rock-shaft F in any suitable manner, but usually by a screw, 6, entering a threaded hole in the end of the shaft. 7

The shaft F has attached the arm F for operating the needle-bar.

The rock-shaft and the mechanism for operating the same may be of any well-known ,or suitable construction.

I am aware that shears have been employed for trimmers on sewing-machines; but heretofore the mechanism for operating such trimming shears has usually been complicated and expensive, requiring a machine constructed for such purposes.

It will be observed that the mechanism that I employ is extremely simple.

In addition to the shears, that are easily attached to the cloth-plate, the rod D and arm E complete the outfit, and the latter is easily attached to the rock-shaft, or, if preferred, to the arm that operates the needle-bar. My improved device can therefore be attached to a great variety of sewingmachines and with little expense.

The arm F and the rock arm E may be made integral instead of separate pieces, as shown in the drawings.

WVhat I claim is '1. The mechanism for operating the vibrating blade of atrimming attachment for a sewin g-machine, consisting of a rod pivotally and directly connected at one end with said blade back of its pivot, and pivotally and directly connected at the other end with an arm projecting from a rock-shaft of the machine, substantially as shown and described. 1

2. The combinatiomwiththe needle-bar-opcrating rock-shaft of a sewing-machine and with the Vibratory blade of a trimming attachment arranged thereon, of a rod pivotally and directly secured to said blade back of its pivot, and to an arm projecting'from the end of said shaft, substantially as specified.

3. The combinationof a fixed blade mounted upon a machine, a vibratory blade pivoted to the fixed blade and to a connecting-rod, and a ICO connecting-rod pivoted to an arm mounted on side of the cloth-plate, andavibratory bladeopthe needle-bar-operating rock-shaft and proerated by means of aconnecting-rod and rockjecting to an opposite side of said shaft from arm, the latter being seqnred to the rock-shaft I 5 that at which the needle-bar-Operating arm is that operates the needle-bar, substantially as 5 arranged, whereby the blade is operated when set forth.

the needle is depressed, substantially as speci- In testimony whereof I sign this specifica- .fied. I tion,in the presence of two witnesses,this 12th 4. The c0mbination,with a sewing-maehine, day of November, 1885. of shears for trimming the fabric, said shears RUEL W. WHITNEY. :0 consisting of a stationary blade bent below Witnesses:

the cutting-edge at right angles, said lateral G. W. SHUMWAY,

portion being detaehably secured to the under N. S. AMsTUTz. 

